US6268044B1 - Heat-shrinkable polyethylene film of high clarity which is easy to open for the wrapping of groups of products - Google Patents
Heat-shrinkable polyethylene film of high clarity which is easy to open for the wrapping of groups of products Download PDFInfo
- Publication number
- US6268044B1 US6268044B1 US09/291,076 US29107699A US6268044B1 US 6268044 B1 US6268044 B1 US 6268044B1 US 29107699 A US29107699 A US 29107699A US 6268044 B1 US6268044 B1 US 6268044B1
- Authority
- US
- United States
- Prior art keywords
- film
- mixture
- polyethylene
- weight
- central layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/91—Product with molecular orientation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
- Y10T428/2826—Synthetic resin or polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31928—Ester, halide or nitrile of addition polymer
Definitions
- the present invention generally relates to heat-shrinkable polyethylene films for the wrapping of groups of products, such as bottles, for example of mineral water or of fruit juice, metal cans, for example beer cans or cans of other drinks, or cartons, for example of milk or of other drinks, and more particularly heat-shrinkable polyethylene films of high clarity which are easy to open.
- Heat-shrinkable polyethylene wrapping films are conventionally produced by monoextrusion or coextrusion by means of an extrusion-blow molding machine.
- the polyethylene film is extruded in an annular die and is swollen in order to form a polyethylene bubble which is subsequently flattened in order to be wound-up.
- the film thus obtained is subsequently used to wrap up groups of products.
- the film is then positioned around the group of products to be wrapped and the assembly is subsequently placed in an oven at an appropriate temperature for the film to shrink around the products of the group in order to grip it and to give it cohesion.
- the first type of film or standard film is composed of one or more mono- or coextruded layers of polyethylene polymerized by the radical route (radical polyethylene).
- the standard films exhibit the disadvantage of being weakly transparent and difficult to open.
- high clarity heat-shrinkable polyethylene films obtained by coextrusion.
- These “high clarity” polyethylene films are three-layer composite films comprising a central layer, predominantly composed of radically catalyzed polyethylene, sandwiched between two, very glossy, special polyethylene layers predominantly comprising either linear polyethylenes obtained by conventionally catalyzed (conventional linear polyethylenes) or linear polyethylenes obtained by metallocene catalyzed synthesis (metallocene linear polyethylenes)
- the outer glossy layers of the “high clarity” films generally comprise from 80 to 90% by weight, with respect to the weight of the polymers, of conventionally catalyzed or metallocene catalyzed linear polyethylene and the central layer comprises more than 50% by weight, with respect to the total weight of the polymers, of standard radical polyethylene.
- the thicknesses of the various layers are generally as follows:
- the central layer generally represents 50% or more of the total thickness of the film.
- heat-shrinkable polyethylene films for wrapping known as “easy to open”, have been produced by mono- or coextrusion. These films exhibit, along their length or their width or in both directions simultaneously, a weak or weakened resistance to tear propagation (Elmendorf) with respect to the standard and “high clarity” films.
- These films are characterized by the presence in the composition of one or more layers of an ionomer in particular of ionomers derived from ethylene copolymers.
- Such ionomers are sold under the trademarks and trade names Surlyn® by the Company Du Pont de Nemours, Iotec® by Exxon Chemicals and Innovex® by the Company BP Chemicals.
- the existing films exhibit the following configurations:
- One of the outer layers is composed of a mixture of ionomers and of polyethylenes or the central layer and an external layer are composed of a mixture of ionomers and of polyethylenes, the remaining layers being composed solely of polyethylenes.
- the central layer is composed of a pure ionomers and the outer layers are composed of polyethylenes or the central layer is composed of polyethylenes and the two outer layers are composed of pure ionomer.
- the subject-matter of the present invention is therefore a heat-shrinkable polyethylene film for the wrapping of groups of products which is simultaneously of high clarity and easy to open.
- a film is called “high clarity” when its gloss, measured according to DIN Standard 67530, is greater than 90% with an angle of 20° and when its haze, measured according to ASTM Standard D 1003, is less than 2%.
- a film is called easy to open when the resistance to tear propagation in the transverse direction according to NF Standard G 03011 is less than 120 cN. Furthermore, the propagation of this tear in the transverse direction must be steady and relatively rectilinear.
- the heat-shrinkable film comprises a central layer sandwiched between two outer layers, wherein:
- the central layer is composed of a mixture of radical catalyzed polyethylene, of conventionally catalyzed linear polyethylene and of at least one ionomers plastic, the radically catalyzed polyethylene and the ionomer representing 50% by weight or more of said mixture and said central layer representing at least 30% of the total thickness of the film; and
- the outer layers which are identical or different, are composed of a mixture of radically catalyzed polyethylene and of conventionally catalyzed and/or metallocene catalyzed linear polyethylene, the conventionally catalyzed and/or metallocene catalyzed linear polyethylene representing more than 50% by weight of the mixture.
- the radically catalyzed polyethylene or polyethylenes generally represent from 20 to 80%, preferably 30 to 70% and better still 40 to 60% by weight of the mixture.
- the radical polyethylenes are well known products which are commercially available. These polyethylenes have a relative density generally of between 0.918 and 0.930.
- the ionomer or ionomers generally represent 10 to 70%, preferably 10 to 50% and better still 20 to 30% by weight of the mixture.
- the ionomers recommended in the present invention are those derived from ethylene copolymers, for example copolymers of ethylene and of methacrylic acid in the partial sodium or zinc salt form.
- Such ionomers are commercially available, for example under the trademarks and trade names: Surlyn® (Surlyn® DH1, Surlyn® SEP870) by the Company Du Pont de Nemours, Iotek® by the Company Exxon and Innovex® (EXP 5059) by the Company BP Chemicals.
- the content of radical polyethylene and of ionomeric plastic must be at least 50% by weight of the mixture of polymers in order to obtain sufficient thermal shrinkage of the film.
- the content of radically catalyzed polyethylene and ionomer will preferably be between 50 and 90% and better still 60 to 80% by weight of the mixture of polymers.
- the central layer has a thickness at least equal to 30%, preferably 50 to 80% and better still of the order of 60% of the total thickness of the film.
- the polyethylene films generally have a total thickness of between 25 and 80 ⁇ m.
- the outer layers can be identical or different in composition but are generally identical in composition.
- these outer layers are composed of a mixture of polyethylenes comprising more than 50% by weight, with respect to the mixture, of conventionally catalyzed and/or metallocene linear catalyzed polyethylene.
- the mixture generally comprises from 50% to 90%, better still of the order of 80%, by weight of linear polyethylene.
- the remainder of the mixture is composed of radically catalyzed polyethylene.
- the conventionally catalyzed and metallocene catalyzed linear polyethylenes are known products which are commercially available.
- the conventionally catalyzed linear polyethylenes have a relative density generally of between 0.915 and 0.930 and the metallocene catalyzed linear polyethylenes a relative density of 0.918 to 0.927, preferably 0.918 to 0.920.
- the mixtures of the various layers can also comprise any adjuvant conventionally used in ordinary preparations, such as, for example, processing aids, such as fluorinated elastomers (in a proportion of 100 ppm or more, generally 500 ppm), antistatic agents and slip agents.
- processing aids such as fluorinated elastomers (in a proportion of 100 ppm or more, generally 500 ppm), antistatic agents and slip agents.
- Processing aids are ingredients which are well known in the technology of polyethylenes and which have the aim of facilitating the extrusion of linear polyethylenes and of preventing the orange peel phenomenon by smoothing the surface of the film.
- Slip agents are also conventional ingredients which have the aim of lowering the coefficient of friction of the film. Mention may be made, among these slip agents, of erucamides.
- a three-layer heat-shrinkable polyethylene film is produced by coextrusion and the compositions and thicknesses of the layers are shown below:
- the ratios of the thicknesses of the outer layers and of the central layer are 20%/60%/20%.
- the film has a total thickness of 60 ⁇ m.
- the resistance to tear propagation of the film was measured.
Abstract
Description
Composition, % by weight |
Central layer | Outer layers | ||
Conventionally Catalyzed | 20 | 80 | ||
Linear PE, 1201 XV | ||||
(Exxon) | ||||
Radical catalyzed PE, 3020 F | — | 20 | ||
(PCD) | ||||
Radical PE, FC 40 | 60 | — | ||
(Polimeri) | ||||
Ionomer, | 20 | — | ||
Surlyn ® (Du Pont de | ||||
Nemours) | ||||
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9804689 | 1998-04-15 | ||
FR9804689A FR2777501B1 (en) | 1998-04-15 | 1998-04-15 | HIGHLY CLEAR, EASY OPENABLE HEAT SHRINKABLE POLYETHYLENE FILM FOR PACKAGING OF PRODUCT GROUPS |
Publications (1)
Publication Number | Publication Date |
---|---|
US6268044B1 true US6268044B1 (en) | 2001-07-31 |
Family
ID=9525260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/291,076 Expired - Fee Related US6268044B1 (en) | 1998-04-15 | 1999-04-14 | Heat-shrinkable polyethylene film of high clarity which is easy to open for the wrapping of groups of products |
Country Status (4)
Country | Link |
---|---|
US (1) | US6268044B1 (en) |
AR (1) | AR019073A1 (en) |
CA (1) | CA2269014C (en) |
FR (1) | FR2777501B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6572979B1 (en) * | 1998-02-26 | 2003-06-03 | E. I. Du Pont De Nemours And Company | Thermoplastic film for packaging |
US20060057410A1 (en) * | 2002-09-16 | 2006-03-16 | Saavedra Jose V | High clarity, high stiffness films |
US20150366230A1 (en) * | 2014-06-19 | 2015-12-24 | Agrofresh Inc. | Compositions and methods for packaging produce |
WO2017056542A1 (en) * | 2015-09-29 | 2017-04-06 | 積水フィルム株式会社 | Multilayered heat-shrinkable film |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56166478A (en) | 1979-12-11 | 1981-12-21 | Fuji Electric Co Ltd | Detector for magnetic flux of ac machine |
JPS5884995A (en) | 1981-11-16 | 1983-05-21 | Nippon Kentetsu Co Ltd | Electrolytic coloring method for aluminum or its alloy |
US4532189A (en) | 1982-02-19 | 1985-07-30 | W. R. Grace & Co., Cryovac Div. | Linear polyethylene shrink films |
US4820557A (en) | 1987-09-17 | 1989-04-11 | W. R. Grace & Co.-Conn. | Thermoplastic packaging film of low I10 /I2 |
US4856656A (en) | 1986-03-17 | 1989-08-15 | Idemitsu Petrochemical Co., Ltd. | Multi-layer film and package |
US5300353A (en) * | 1990-11-14 | 1994-04-05 | Asahi Kasei Kogyo Kabushiki Kaisha | Shrinkable, stretchable multi-layered film |
US5604043A (en) * | 1993-09-20 | 1997-02-18 | W.R. Grace & Co.-Conn. | Heat shrinkable films containing single site catalyzed copolymers having long chain branching |
WO1998021276A1 (en) | 1996-11-13 | 1998-05-22 | The Dow Chemical Company | Shrink film having balanced properties or improved toughness and methods of making the same |
US6074715A (en) * | 1993-06-24 | 2000-06-13 | Pechiney Plastic Packaging, Inc. | Heat shrinkable barrier bags |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5867450A (en) * | 1981-10-20 | 1983-04-22 | 株式会社 興人 | Polyamide group laminated heat-shrinkable film |
JPS59212261A (en) * | 1983-05-17 | 1984-12-01 | 住友ベークライト株式会社 | Heat-shrinkable multilayer film |
-
1998
- 1998-04-15 FR FR9804689A patent/FR2777501B1/en not_active Expired - Lifetime
-
1999
- 1999-04-13 CA CA 2269014 patent/CA2269014C/en not_active Expired - Fee Related
- 1999-04-14 US US09/291,076 patent/US6268044B1/en not_active Expired - Fee Related
- 1999-04-15 AR ARP990101734 patent/AR019073A1/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56166478A (en) | 1979-12-11 | 1981-12-21 | Fuji Electric Co Ltd | Detector for magnetic flux of ac machine |
JPS5884995A (en) | 1981-11-16 | 1983-05-21 | Nippon Kentetsu Co Ltd | Electrolytic coloring method for aluminum or its alloy |
US4532189A (en) | 1982-02-19 | 1985-07-30 | W. R. Grace & Co., Cryovac Div. | Linear polyethylene shrink films |
US4856656A (en) | 1986-03-17 | 1989-08-15 | Idemitsu Petrochemical Co., Ltd. | Multi-layer film and package |
US4820557A (en) | 1987-09-17 | 1989-04-11 | W. R. Grace & Co.-Conn. | Thermoplastic packaging film of low I10 /I2 |
US5300353A (en) * | 1990-11-14 | 1994-04-05 | Asahi Kasei Kogyo Kabushiki Kaisha | Shrinkable, stretchable multi-layered film |
US6074715A (en) * | 1993-06-24 | 2000-06-13 | Pechiney Plastic Packaging, Inc. | Heat shrinkable barrier bags |
US5604043A (en) * | 1993-09-20 | 1997-02-18 | W.R. Grace & Co.-Conn. | Heat shrinkable films containing single site catalyzed copolymers having long chain branching |
WO1998021276A1 (en) | 1996-11-13 | 1998-05-22 | The Dow Chemical Company | Shrink film having balanced properties or improved toughness and methods of making the same |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6572979B1 (en) * | 1998-02-26 | 2003-06-03 | E. I. Du Pont De Nemours And Company | Thermoplastic film for packaging |
US20060057410A1 (en) * | 2002-09-16 | 2006-03-16 | Saavedra Jose V | High clarity, high stiffness films |
US8092920B2 (en) | 2002-09-16 | 2012-01-10 | Dow Global Technologies Llc | High clarity, high stiffness films |
US20150366230A1 (en) * | 2014-06-19 | 2015-12-24 | Agrofresh Inc. | Compositions and methods for packaging produce |
US10701949B2 (en) * | 2014-06-19 | 2020-07-07 | Agrofresh Inc. | Compositions and methods for packaging produce |
WO2017056542A1 (en) * | 2015-09-29 | 2017-04-06 | 積水フィルム株式会社 | Multilayered heat-shrinkable film |
Also Published As
Publication number | Publication date |
---|---|
CA2269014A1 (en) | 1999-10-15 |
FR2777501B1 (en) | 2000-06-09 |
AR019073A1 (en) | 2001-12-26 |
CA2269014C (en) | 2008-04-08 |
FR2777501A1 (en) | 1999-10-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SOCIETE DE CONDITIONNEMENT ET INDUSTRIE SOCIETE AN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GRANGETTE, MICHEL;REEL/FRAME:010142/0580 Effective date: 19990528 |
|
CC | Certificate of correction | ||
FPAY | Fee payment |
Year of fee payment: 4 |
|
AS | Assignment |
Owner name: CEISA PACKAGING, FRANCE Free format text: MERGER;ASSIGNOR:SOCIETE DE CONDITIONNEMENT ET INDUSTRIE S.A. (CEISA);REEL/FRAME:020828/0450 Effective date: 20080411 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20130731 |